diff --git a/mlir/include/mlir/Dialect/OpenMP/OpenMPOps.td b/mlir/include/mlir/Dialect/OpenMP/OpenMPOps.td
--- a/mlir/include/mlir/Dialect/OpenMP/OpenMPOps.td
+++ b/mlir/include/mlir/Dialect/OpenMP/OpenMPOps.td
@@ -783,6 +783,27 @@
   let assemblyFormat = "attr-dict";
 }
 
+//===----------------------------------------------------------------------===//
+// 2.11.9.2 unroll Construct
+//===----------------------------------------------------------------------===//
+def UnrollOp : OpenMP_Op<"unroll", [AttrSizedOperandSegments]> {
+  let summary = "unroll construct";
+  let description = [{
+    The unroll construct fully or partially unrolls a loop.
+  }];
+
+  let arguments = (ins Optional<I1>:$full_operand,
+                       Optional<AnyInteger>:$partial_operand);
+
+  let regions = (region AnyRegion:$region);
+
+  let assemblyFormat = [{ ( `full` `(` $full_operand^ `:` type($full_operand) `)` )?
+  			   ( `partial` `(` $partial_operand^ `:` 	
+  			    		    type($partial_operand)`)` )?		 
+     $region attr-dict
+  }];
+}
+
 //===----------------------------------------------------------------------===//
 // 2.13.7 flush Construct
 //===----------------------------------------------------------------------===//